the difference is in the backbone... if the backbone is unsaturated then it is an unsaturated polyester, if the backbone is saturated then it is a saturated polyester...
Polyester refractive chemical
No
65
polar
Yes
Polyester resins can be skin sensitizers. In addition, unsaturated polyesters also contain styrene monomer. While this is not a proven carcinogen, breathing the vapors is not healthy.
Additive : halogenated additive Filler : Aluminium Hydroxide (ATH)
YES , Bakelite is a thermosetting plastic .
Talc is a very important functional filler in putty made of unsaturated polyester. It is used here in proportions of up to 60 percent by weight. The quality of the putty ingredient 'talc' has a significant effect on putty performance.
Bakelite is a thermoplastic (non-metal)
Bakelite can be considered a resol.